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f(1)=> a + b = 3
f(-3)=> -3a + b = 11 _
4a = -8
a = -8/4
a = -2
salah satu ruas
a + b = 3
-2 + b = 3
b = 3+ 2
b = 5
a) 1a + b = 3
-4a = 8
a = -2
1a + b = 3
1(-2) + b = 3
-2 + b = 3
b = 3 + 2
= 5
b) f() = a + b
= -2 + 5